Search for Pentaquark Θ + in Hadronic Reaction at J-PARC

M Naruki ,V V Kulikov,A O Tokiyasu,R Kiuchi,S Sawada,Y Igarashi,S Marcello,N Tomida,R Iwasaki,K Itahashi,B Bassalleck,A Feliciello,K Hosomi,K Tanida,M Sekimoto,M Niiyama,S Ishimoto,S Ajimura,K Matsuoka,M J Kim,K Shirotori,K Imai,K Ozawa ,Ryumon Honda ,A Sakaguchi ,K Miwa ,S Suzuki ,S J Kim ,M Ukai ,Y Ichikawa ,F Hiruma ,M Sato ,Hyunwoo Bang ,В Н Самойлов ,Ryosuke Ota ,S Bufalino ,Kenzô Yagi ,T Koike ,Shunsuke Kanatsuki ,Susumu Sato ,S Masumoto ,Nobuyuki Ishibashi ,H Ekawa ,M Ieiri ,Yukinori Yonemoto ,Gun-Ho Joo ,Manabu Moritsu ,H Noumi ,T Nagae ,Satoshi Adachi ,P Evtoukhovitch ,Yusuke Komatsu ,Shuhei Hayakawa ,Yuki Matsumoto ,T O Yamamoto ,Hiroyuki Fujioka ,Hitoshi Sugimura ,T Takahashi ,E Botta ,C J Yoon ,S B Yang ,H Sako ,N Saito ,Y Nozawa ,Toshiyuki Tanaka ,H Tamura ,Y Sato ,Katsumi Aoki ,Hajime Takahashi ,Z Tsamalaidze ,M Agnello ,Kotaro Yoshida

doi:10.1007/s00601-013-0685-2

Abstract

The first experiment at the J-PARC hadron facility, the J-PARC E19 experiment, aims at searching for the Θ + pentaquark in the hadronic reaction π − p → K − X using the missing-mass technique. Based on a superconducting magnet excited at 2.5 T, the spectrometer achieved the high mass resolution of 1.4 MeV/c2 for the Θ + production process. The first data taking was performed in the autumn of 2010. No significant structure was observed in the missing-mass spectrum. The upper limit obtained for the differential cross section is 0.26 μb/sr in the laboratory frame at a 90 % CL.

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